Emails and Attachments
Calendars and Contacts
Shared Mailboxes

Mailboxes on Litigation Hold or In-Place Hold
OneDrive Files*
SharePoint Files within Document Libraries**
Files Shared on Microsoft Teams and Team Sites*** (click here for more info)
Archived Mailboxes 
Shared Folders
Public Folders
Site Assets Libraries
Microsoft Teams

* We only backup files and folders within OneDrive accounts

** We only backup files and folders within SharePoint Sites & Teams Sites

*** For more information about what files can and cannot be backed up from MS Teams, please visit this article

Altaro Office 365 Backup does not support backing up the following items (list is not exhaustive): Conversation History, Drafts, Hidden Folders, Junk Email, Notes, Outbox, Recoverable items (permanently deleted email folders), Sync Issues, Yammer, Microsoft Booking Items, Microsoft OneNote Items (files with .one extension are excluded), Microsoft Teams, Contact groups, Items in OneDrive Recycle Bin, SharePoint customisations, SharePoint Public Sites, SharePoint Apps from SharePoint Store, SharePoint Custom Lists, malware flagged items and sensitive files flagged by the Data Loss Prevention policy.